Conduit.



UNITED STATES PATENT OFFICE.

JAMES S. VTILSON, OF CHELSEA, MASSAHUSETTS.

CONDUIT.

To all 'whom it may concem:

Be it known that I, J AMES S. VVILsoN, of Chelsea, in the count-y of Sufiolk and State of Massachusetts, have inventecl certain new and useful Improvements in Conduits, of which the following is a specification.

In the use of conduits for wires, after the conduits have been placed in position in a building, or elsewhere, it is the practice to run a fish, so called, comprising a long strip of flexible wire through the conduit. Thereafter, the end of a cord, or other drawing means, is Secured to the fish and drawn through the conduit. The end of the wire to be drawn into the conduit is then secured to this cord and pulled into the conduit. Considerable delay and time is required for the insertion of the fish into the conduit and getting the cord in place ready to draw the wire. By my invention this clitfioulty is overcome, since I construct the conduit with a fish or cord loosely connected to its interior wall, extending the length of the conduit so that wherever the conduit is cut, one end of this fish or cord can be seized, the union between the cord or fish member and the interior wall of the conduit being only suflicient to keep the cord in place and to offer no practical resistance to a pull on the cord.

Figure 1 is a longitudinal sectional view of a conduit constructed in accordance with my inventon, showing the cord or fish member Secured at intervals to the top of the conduit and arranged in the conduit in the form of sags or loops, Fig. 2 is a crosssectional View of the same. Fig. 3 is a view similar to Fig. 1, showing the fish member arranged in the conduit to form an elongated heliX, the helix at some of its points engaging the walls of the Conduit. Fig is a cross-sectional View of the Construction shown in Fig. 3. Fig. 5 is a view similar to Fig. 1, showing the cord or fish member arranged in the conduit in the form of loops, some of the alternate bends being secured to the wall of the conduit. Fig. 6 is a crosssectional view of the Construction shown in Fig. 5. Fig. 7 is a detail view of the cord or fish member arranged as in Fig. 1. Fig. 8 is a detail View of the fish or cord member as arranged in Fig. 3. Fig. 9 is a detail view of the fish or cord member as arranged in Fig. 5.

10 represents a conduit, which may be of any preferred material, such as metal, fiber,

Specficaton of Letters Patent.

Application filed December 27, 1909.

Patented Mar. 19, 1912.

Serial No. 535,109.

composition, and of any preferred construotion, such as rigid, fiexible, or having simple or compound walls. The conduit shown here is shown merely in a conventional way for the purpose of illustrating the invention.

11 represents a cord or fish member adapted to be arranged in the conduit at the time of manufacture and maintained against accidental displacement by contact against the walls of the conduit, or by any other means. This resultcould be Secured by having the fish member 11 arranged in the form of a loose heliX, as shown in Fig. 3, the turns of the heliX at one or more points engaging the walls of the conduit to maintain the member ll against accidental displacement. The fish member may be arranged as shown in F ig. l, in the form of loose loops, separably connected at one or more points, as 12, by any mechanical means, such as stitching, or the application of an adhesive substance. In Fig. 5, still another method is shown of arranging the fish member where the wire is bent in the same plane and the bends, as at 13, at one or more points, engage the walls of the conduit sufliciently to prevent acciclental displacement. A sinuous form of the fish member, that is to say, either the helical form shown in Figs. 3, 4:, and 8, or the wavy form shown in the other figures, is desirable, since it enables the fish member to bear advantageously on, and separably engage the wall of the conduit. When the fish member is of helical form, or when it has its undulations formed to bear simultaneously on opposite sides of the conduit wall, as shown by Figs. 5 and 6, a frictional resistance is set up between the fish member and the conduit, tending to prevent endwise displacement of the fish member.

The foregoing are merely illustrations of the idea and are not intended to show all the ways in which the fish member may be maintained in the conduit. Then it is desired to use a conduit after it is put in place, the wire to be pulled through, if it be a small one, can be secured to the member 11 and readily pulled through, the member 11 leaving the walls of the conduit on a direct pull. If the wire be too large for the strength of the member 11, the member ll can be used to draw through a pulling rope.

Having thus eXplained the nature of my invention and described a way of constructing and using the same, though without attempt-ing to set forth all of the forms in 2. A Conduit and a longtudinally eX- tending fish member located within the conclut, and having a snnous form Whereby t engages the Wall of the conclut.

In testmony whe'eof I have afixed my 15 signature, in presence of two witnesses.

JAMES S. VVILSON. VVtnesses:

H. L. ROBBINS, P. W. PEZZETTI.

which t may be made, or all of the modes of its use, What I claim and desre to secure by Letters Patent is:-

1. A Conduit and a longtudnally eX- tenclng fish member located Wthn the c0ndut and engaged With the Wall of the condut to prevent accdental longt-udnal displacement of the fish member, and permit fts endWse movement by the application of orce.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 03 

